IR and XRD Analyses of Alkali Cation Forms of Y-Zeolites Prepared by Solid-state Ion Exchange

Zeolties MY（M=Li, K, Rb and Cs）were prepared by solid-state ion exchange between NH₄Y and respective chlorides and analyzed by IR and XRD The degree of exchange strongly depends upon the sizes of alkali cations LiY with nearly 100% of the degree of exchange can be obtained via solid-state reaction due to the small size of Li⁺cations In the cases of the solid-state reactions of RbCl or CsCl with NH₄Y, the degrees of exchange are much higher than those via aqueous exchange, but relatively lower than that of LiY due to the large sizes of Rb⁺ and Cs⁺which partially prevent the cations from penetrating into the small cages of the zeolites For the preparation of KY, due to the similar size of K⁺to that of β cages of the zeolite and the large crystalline energy of KCl, the degrees of one-fold solid-state and aqueous exchange are similar.